Our most important loss was two barrels of gunpowder, which had been left in the tent, instead of under the shelter of the rock, and which the rain had rendered wholly useless. This made us feel still more strongly the necessity of securing for the future a more suitable shelter than a canvas tent, or a roof of foliage. Still I had small hope from the gigantic plan of Fritz or the boldness of Jack. I could not be blind to the difficulties of the undertaking. The rocks which surrounded Tent House presented an unbroken surface, like a wall without any crevice, and, to all appearance, of so hard a nature as to leave little hopes of success. However, it was necessary to try to contrive some sort of cave, if only for our gunpowder. I made up my mind, and selected the most perpendicular face of the rock as the place to begin our work. It was a much pleasanter situation than our tent, commanding a view of the whole bay, and the two banks of Jackal River, with its picturesque bridge. I marked out with chalk the dimension of the entrance I wished to give to the cave; then my sons and I took our chisels, pickaxes, and heavy miner’s hammers, and began boldly to hew the stone.
Our first blows produced very little effect; the rock seemed impenetrable, the sun had so hardened the surface; and the sweat poured off our brows with the hard labour. Nevertheless, the efforts of my young workmen did not relax. Every evening we left our work advanced, perhaps, a few inches; and every morning returned to the task with renewed ardour. At the end of five or six days, when the surface of the rock was removed, we found the stone become easier to work; it then seemed calcarious, and, finally, only a sort of hardened clay, which we could remove with spades; and we began to hope. After a few days’ more labour, we found we had advanced about seven feet. Fritz wheeled out the rubbish, and formed a sort of terrace with it before the opening; while I was working at the higher part, Jack, as the least, worked below. One morning he was hammering an iron bar, which he had pointed at the end, into the rock, to loosen the earth, when he suddenly cried out—
“Papa! papa! I have pierced through!”
“Not through your hand, child?” asked I.
“No, papa!” cried he; “I have pierced through the mountain! Huzza!”
Fritz ran in at the shout, and told him he had better have said at once that he had pierced through the earth! But Jack persisted that, however his brother might laugh, he was quite sure he had felt his iron bar enter an empty space behind. I now came down from my ladder, and, moving the bar, I felt there was really a hollow into which the rubbish fell, but apparently very little below the level we were working on. I took a long pole and probed the cavity, and found that it must be of considerable size. My boys wished to have the opening enlarged and to enter immediately, but this I strictly forbade; for, as I leaned forward to examine it through the opening, a rush of mephitic air gave me a sort of vertigo. “Come away, children,” cried I, in terror; “the air you would breathe there is certain death.” I explained to them that, under certain circumstances, carbonic acid gas was frequently accumulated in caves or grottoes, rendering the air unfit for respiration; producing giddiness of the head, fainting, and eventually death. I sent them to collect some hay, which I lighted and threw into the cave; this was immediately extinguished; we repeated the experiment several times with the same result. I now saw that more active means must be resorted to.
We had brought from the vessel a box of fireworks, intended for signals; I threw into the cave, by a cord, a quantity of rockets, grenades, &c., and scattered a train of gunpowder from them; to this I applied a long match, and we retired to a little distance. This succeeded well; a great explosion agitated the air, a torrent of the carbonic acid gas rushed through the opening, and was replaced by the pure air; we sent in a few more rockets, which flew round like fiery dragons, disclosing to us the vast extent of the cave. A shower of stars, which concluded our experiment, made us wish the duration had been longer. It seemed as if a crowd of winged genii, carrying each a lamp, were floating about in that enchanted cavern. When they vanished, I threw in some more lighted hay, which blazed in such a lively manner, that I knew all danger was over from the gas; but, for fear of deep pits, or pools of water, I would not venture in without lights. I therefore despatched Jack, on his buffalo, to report this discovery to his mother, and bring all the candles she had made. I purposely sent Jack on the errand, for his lively and poetic turn of mind would, I hoped, invest the grotto with such charms, that his mother would even abandon her wheel to come and see it.
Delighted with his commission, Jack leaped upon his buffalo, and, waving his whip, galloped off with an intrepidity that made my hair stand on end. During his absence, Fritz and I enlarged the opening, to make it easy of access, removed all the rubbish, and swept a road for mamma. We had just finished, when we heard the sound of wheels crossing the bridge, and the cart appeared, drawn by the cow and ass, led by Ernest. Jack rode before on his buffalo, blowing through his hand to imitate a horn, and whipping the lazy cow and ass. He rode up first, and alighted from his huge courser, to help his mother out.
I then lighted our candles, giving one to each, with a spare candle and flint and steel in our pockets. We took our arms, and proceeded in a solemn manner into the rock. I walked first, my sons followed, and their mother came last, with Francis. We had not gone on above a few steps, when we stopped, struck with wonder and admiration; all was glittering around us; we were in a grotto of diamonds! From the height of the lofty vaulted roof hung innumerable crystals, which, uniting with those on the walls, formed colonnades, altars, and every sort of gothic ornament of dazzling lustre, creating a fairy palace, or an illuminated temple.